Thank you very much! I've successfully builded gcc-core-4.1.2 and gcc-g++-4.1.2.You are right.The reason is I used mingw's make, not cygwin's.
When building it I found an error in auto-generated file /gcc/configargs.h.If having interest,copy the code below and compile it with gcc,see what the results will be. static const char configuration_arguments[] = "../gcc-4.1.2/configure -prefix=/opt/gcc412 "; Unlike gcc when compiling with Vc7 it's OK.If you know why,please tell me. After appending opt/bin to PATH,g++4.1.2 can work. $ gcc -v Using built-in specs. Target: i686-pc-cygwin Configured with: ../gcc-4.1.2/configure -prefix=/opt/gcc412 Thread model: single gcc version 4.1.2 It seems include files and library's path have been set automaticly. Where are the settings?I typed set to list all environment variables,but I didn't see LIBRARY_PATH,C_INCLUDE_PATH and so on. After building gcc,I wanted to build g++.but I didn't know how to build it alone.So after unziping gcc-g++-4.1.2.tar.bz2 I used the configure file in gcc-core-4.1.2.tar.bz2.Did the generated makefile rebuild gcc-core? -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/